Electro-acoustic converters, electronic devices, waterproof covers, and air leakage test methods for electro-acoustic converters
It is an object to provide an electro-acoustic converter which can be subjected to air leakage test allowing a gas to pass through a waterproof film in such a condition that the waterproof film is attached to the electro-acoustic converter. An electro-acoustic converter is produced, which includes: a casing having a sound hole; and a diaphragm provided in the casing, wherein the sound hole is covered with the waterproof film to form a closed space, and the closed space is in communication with the outside of the casing through a vent for air leakage test.
1. An electro-acoustic converter comprising:
a casing having at least one sound hole and a vent in the casing;
a diaphragm provided in the casing;
a frame attached to the casing and having a sound opening aligned with the at least one sound hole and a frame opening aligned with the vent in the casing; and
a waterproof film disposed in the frame and covering the sound hole of the casing, wherein the waterproof film has a film opening aligned with both the frame opening and the vent in the casing.
2. The electro-acoustic converter according to claim 1 , wherein the Gurley air resistance of the waterproof film is one second or higher.
3. The electro-acoustic converter according to claim 1 , wherein the waterproof film is a porous polytetrafluoroethylene film.
4. The electro-acoustic converter according claim 1 , wherein the electro-acoustic converter is a sound wave receiver.
5. The electro-acoustic converter according to claim 1 , wherein the electro-acoustic converter is a sound wave generator.
6. The electro-acoustic converter according to claim 1 , wherein the vent for air leakage test is provided with a sealer.
7. The electro-acoustic converter according to claim 1 , wherein an elastic material is formed on part or all of a periphery of the casing.
8. The electro-acoustic converter according to claim 7 , wherein the vent for air leakage test is sealed with the elasticmaterial.
9. An electronic device comprising:
an outer casing having a concave portion; and
an electro-acoustic converter disposed in the concave portion of the outer casing, the electro-acoustic converter comprising:
a casing having at least one sound hole and a vent in the casing;
a diaphragm provided in the casing;
a frame attached to the casing and having a sound opening aligned with the at least one sound hole and a frame opening aligned with the vent in the casing; and
a waterproof film disposed in the frame and covering the sound hole of the casing, wherein the waterproof film has a film opening aligned with both the frame opening and the vent in the casing.
10. The electronic device of claim 9 , wherein the electro-acoustic converter is in contact with part of the outer casing, so that the vent for air leakage test is sealed.